RaceFace 12 Speed Direct Mount Shimano Chainring 32T  prevent chain drop, updated tooth profile runs quieter Installs with a common Park BBT-22 tool Shimano 12 speed specific 7075-T6 aluminum direct mount ring to fit Race Face Cinch system splined cranks Narrow-wide teeth prevent chain drop, updated tooth profile runs quieter Installs with a common Park BBT-22 tool RaceFace 12 Speed Direct Mount Shimano Chainring 32T Features Ring type: single (anti-chain drop) ArmxBCD: Cinch direct mount Teeth: 32t Color: black